LXR qemu/hw/xen/xen_pt_load

   1/*
   2 * This is splited from hw/i386/kvm/pci-assign.c
   3 */
   4#include "qemu/osdep.h"
   5#include "qapi/error.h"
   6#include "qemu/error-report.h"
   7#include "hw/loader.h"
   8#include "hw/pci/pci.h"
   9#include "xen_pt.h"
  10
  11/*
  12 * Scan the assigned devices for the devices that have an option ROM, and then
  13 * load the corresponding ROM data to RAM. If an error occurs while loading an
  14 * option ROM, we just ignore that option ROM and continue with the next one.
  15 */
  16void *pci_assign_dev_load_option_rom(PCIDevice *dev,
  17                                     int *size, unsigned int domain,
  18                                     unsigned int bus, unsigned int slot,
  19                                     unsigned int function)
  20{
  21    char name[32], rom_file[64];
  22    FILE *fp;
  23    uint8_t val;
  24    struct stat st;
  25    void *ptr = NULL;
  26    Object *owner = OBJECT(dev);
  27
  28    /* If loading ROM from file, pci handles it */
  29    if (dev->romfile || !dev->rom_bar) {
  30        return NULL;
  31    }
  32
  33    snprintf(rom_file, sizeof(rom_file),
  34             "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
  35             domain, bus, slot, function);
  36
  37    /* Write "1" to the ROM file to enable it */
  38    fp = fopen(rom_file, "r+");
  39    if (fp == NULL) {
  40        if (errno != ENOENT) {
  41            error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
  42        }
  43        return NULL;
  44    }
  45    if (fstat(fileno(fp), &st) == -1) {
  46        error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno));
  47        goto close_rom;
  48    }
  49
  50    val = 1;
  51    if (fwrite(&val, 1, 1, fp) != 1) {
  52        goto close_rom;
  53    }
  54    fseek(fp, 0, SEEK_SET);
  55
  56    if (dev->romsize != -1) {
  57        if (st.st_size > dev->romsize) {
  58            error_report("ROM BAR \"%s\" (%ld bytes) is too large for ROM size %u",
  59                         rom_file, (long) st.st_size, dev->romsize);
  60            goto close_rom;
  61        }
  62    } else {
  63        dev->romsize = st.st_size;
  64    }
  65
  66    snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
  67    memory_region_init_ram(&dev->rom, owner, name, dev->romsize, &error_abort);
  68    ptr = memory_region_get_ram_ptr(&dev->rom);
  69    memset(ptr, 0xff, dev->romsize);
  70
  71    if (!fread(ptr, 1, st.st_size, fp)) {
  72        error_report("pci-assign: Cannot read from host %s", rom_file);
  73        error_printf("Device option ROM contents are probably invalid "
  74                     "(check dmesg).\nSkip option ROM probe with rombar=0, "
  75                     "or load from file with romfile=\n");
  76        goto close_rom;
  77    }
  78
  79    pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
  80    dev->has_rom = true;
  81    *size = st.st_size;
  82close_rom:
  83    /* Write "0" to disable ROM */
  84    fseek(fp, 0, SEEK_SET);
  85    val = 0;
  86    if (!fwrite(&val, 1, 1, fp)) {
  87        XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file");
  88    }
  89    fclose(fp);
  90
  91    return ptr;
  92}
  93